You can always use Mastodon from the browser on your desktop or phone! It can be added to your home screen and some browsers even support push notifications, just like a native app!
Join a communityMastodon is open-source and has an elegant, well-documented API that is available to everyone. Make your own app, or use one of the many third-party apps made by other developers!
API documentationThanks to Mastodon's open API, you can use it from any of these apps developed by third-party developers